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Anomalous spin dynamics in CdCu2(BO3)2 revealed by 11 B NMR and ZF- μsR

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Title
Anomalous spin dynamics in CdCu2(BO3)2 revealed by 11 B NMR and ZF- μsR
Author(s)
Lee W.-J.; Do S.-H.; Yoon S.; Jang Z.H.; Suh B.J.; Lee J.H.; Reyes A.P.; Kuhns P.L.; Luetkens H.; Choi K.-Y.
Publication Date
2014-12
Journal
PHYSICAL REVIEW B, v.90, no.21, pp.214416-1 - 214416-7
Publisher
AMER PHYSICAL SOC
Abstract
We report 11Bnuclear magnetic resonance (NMR)and zero-field muon spin relaxation (ZF-μSR)measurements of the anisotropic spin tetramer system CdCu2 (BO3) 2, which consists of strongly interacting Cu(1) dimers and weakly coupled nonfrustrated Cu(2) spins. Long-range magnetic order is observed at TN = 9.8 K by a critical divergence of the nuclear spin-lattice relaxation rate 1/T1 and an appearance of well-defined muon-spin precessions. In addition, we find the spectroscopic signature for a magnetic anomaly at T ∗ = 6.5 K, a few kelvins below TN. For temperatures below T ∗, 1/T1 ceases to follow a T 4.9(1) behavior. Instead, upon cooling below T ∗, both 1/T1 and 1/T2 become temperature-independent with a subsequent small drop. The muon frequency and the relative fraction of the Cu magnetic sites show anomalies mostly for Cu(2) spins at T ∗. This is ascribed to a Cu(2) spin reorientation. Site-specific change in magnetic structure is discussed in terms of the energy hierarchy of involved exchange interactions and an additional intertetramer interaction that controls magnetism at temperature T ∗.
URI
http://pr.ibs.re.kr/handle/8788114/2938
DOI
10.1103/PhysRevB.90.214416
ISSN
1098-0121
Appears in Collections:
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